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Originally Posted by luilocs
what else besides the screen is needed to upgrade to a factory navigation?
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You will need the following:
16:9 screen monitor
MK4 DVD Computer
Radito Tuner BM53
Nav Harness
GPS Antenna
I have done the retrofitting myself on my e46 but my X comes with it already. You're looking at about more than $2K to spend. OEM setup IMO is better and doesnt look awkward in your dash but just limited in features.